;experiment 8
assume cs:codesg

codesg segment
	mov ax,4c00h
	int 21h
	
start:
	mov ax,0
	s:;(jmp short s1)

	mov di,offset s 
	mov si,offset s2
	mov ax,cs:[si]
	mov cs:[di],ax		;s2复制到s处，s2里的是jmp short s1,
	
	s0:
	jmp short s
	s1:
	mov ax,0
	int 21h
	mov ax,0
	
	s2:
	jmp short s1
codesg ends

end start